Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Current assets
Cash and cash equivalents	$ 16.3	$ 24.8
Accounts receivable and unbilled revenues, net of reserves of $198.3 and $220.1, respectively	1,505.7	1,202.8
Materials, supplies, and inventories	635.8	528.6
Prepayments	245.5	263.4
Other	253.4	63.4
Current assets	2,656.7	2,083.0
Long-term assets
Property, Plant and Equipment, Net	26,982.4	25,707.4
Regulatory assets (December 31, 2021 includes $100.7 related to WEPCo Environmental Trust)	3,264.8	3,524.1
Equity investment in transmission affiliates	1,789.4	1,764.3
Goodwill	3,052.8	3,052.8
Pension and OPEB assets	881.3	600.9
Other	361.1	295.6
Long-term assets	36,331.8	34,945.1
Total assets	38,988.5	37,028.1
Current liabilities
Short-term debt	1,897.0	1,776.9
Current portion of long-term debt (December 31, 2021 includes $8.8 related to WEPCo Environmental Trust)	169.4	785.8
Accounts payable	1,005.7	880.7
Other	680.9	704.7
Current liabilities	3,753.0	4,148.1
Long-term liabilities
Long-term debt (December 31, 2021 includes $102.7 related to WEPCo Environmental Trust)	13,523.7	11,728.1
Deferred income taxes	4,308.5	4,059.8
Deferred revenue, net	389.2	412.2
Regulatory liabilities	3,946.0	3,928.1
Environmental remediation liabilities	532.6	532.9
Pension and OPEB obligations	219.0	327.0
Other	1,203.2	1,229.4
Long-term liabilities	24,122.2	22,217.5
Commitments and contingencies (Note 24)
Common shareholders' equity
Common stock – $0.01 par value; 325,000,000 shares authorized; 315,434,531 shares outstanding	3.2	3.2
Additional paid in capital	4,138.1	4,143.7
Retained earnings	6,775.1	6,329.6
Accumulated other comprehensive loss	(3.2)	(6.8)
Common shareholders' equity	10,913.2	10,469.7
Preferred stock of subsidiary	30.4	30.4
Noncontrolling interests	169.7	162.4
Total liabilities and equity	$ 38,988.5	$ 37,028.1